Blast-furnace.



ATENTED JULY 23, 1,907.

MAUDONALD. BLAST PURNAGE l APPLIOATION FILED JUNE 12,1905.

WITNSSES INVENTOR UNITED sTATns PATENT' ormoni.

JOHN W. MACDONALD, OF PITTSBURG, PENNSYLVANIA.

Specicationof Letters Patent.

Patented July 23, 1907.

Application filed June 12, 1905. Serial No. 264,789.

To all whom 'it may concern:

Be it known that I, JOHN W. MACDONALD, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented an improvement in that class of blast-furnaces in which the walls thereof next the points of `greatest heat are formed of a series of water-cooled metal jackets, which consists in arranging the twyers for such furnaces in specially-constructed Water-cooled chambers independent of .said metal jackets and designed to be separately removable from the furnace-walls'without disturbing any part of said walls.

It is well understood by those familiar with the present method of arranging the twyers in, and the operation of furnaces of the class referred to, that owing to the expansion and contra'ctiouof the metal formingv the inside sheets of the water jackets of such furnaces,- said sheets frequently become warped and buckle up, and that this warping and buckling causes the joints formed between the twyeis and said jackets to open upand permit the water in said jackets to'leak out into the furnace, preventing its successful operation, and

often making necessary'the removal of one or more of said jackets, Awhich cannot always be done without closing down the furnace. ln either levent the output f and the application of this improvement. Fig. 2 is a perspective View of one of the twyer chambers removed, and Fig. 3 is a sectional view of said twyer chamber on aline drawn through the twyers.

In applying said improvement, a series of twyer chambers l are cast from some suitable metal, preferably in the form shown, having an outer casing 2, of such size as to contain one or more twyers 3 and provide the water space 4, and having openings 5 and 6 to receive Water supply and discharge pipes 7 and 8. As these twyer chambers are designed to form a section of the furnace walls, on the line of the furnace twyers,

that part of said walls with which this improvement has to do, is divided into a lower section 9 and an upper section l0, between which sections said twyer chaincause of leaks at the twyers under present bers are arranged as shown in Fig. l. Section 9 of said walls extends from the furnace hearth up to .said

twyerchambers,and is formed of Aa series of short Water jackets, or it may be built up of suitable brick, and section 10 extends from said twyer chambers to a height common to such form of furnace, and is constructed of water jackets of the usual form, suspended fromthe substructure of the furnace in the manner commonly practiced, leaving suicient space between said sections to receive said twyer chambers. Said' twyer chambers may be made any desired length, but it'will be under- -stood that as said chambers are to occupy the whole space between the upper and lower sections of the furnace walls, the length and number thereof must be such that when lplaced in position, with their ends joining, said chambers will neatly close` the gap b etween said sections. Said chambers are held in place by means of clamps 11, and water is circulated through them by means of pipes 7 and 8, which connect with main pipes for the supply and discharge of water to and from other parts of the furnace. Pipe 12 Afor the supplyvof blast connects with each of the twyers 2 in the ordinary way. By disconnecting' pipes for the supply of blast, and pipes 7 and 8, and yreleasing clamps l1, any one or more of said twyer chambers may be removed as desired. It will be seen that if said twyer chambers are castd from suitable metal, with all Il corners made rounding, danger of their cracking and causing leaks will be reduced to a minimum, and as the twyers are removed from the water jackets, the existing y practice is eliminated in the construction here shown.

l What I claim and desire to secure by Letters Patent,v

1. In u. furnace of 'the class described, having the walls thereof, formed of water jackets, a series of small outwardly removable water cooled chambers containing the furnace twyers, contiguously arranged ln the furnace walls ln such manner as to form when in place, a section ofisaid walls,.and clamps for holding said chambers in p0- sition; as shown and describedfand for the purpose set forth.

2. In a furnace of the class described, having the walls thereof formed of water jackets, twyei's forming an in'tegral part of oiitwardlyi'cmovable water cooled chambers coiitguously arranged 'inthe fui-nace walls in such manner as to form, when in place, a section, 'of 'said walls, and

clumps for. holding said chambers in position; as shown and described, and for the purpose sci: forth.

3, In a furnace of the class described, having the walls thereof arranged in upper and lower sections, twyers forming an integral part of water cooled chambers contigiiously arranged in said walls intermediate of the upper section and lower section thereof; the said chambers form- Ing, when in place, a section of' said Wallsand being out- Wardly removable therefrom, and champs for'holding said chambers in position; as shown an@ described and for the purpose set ,forth 4. A furnace of the class'described, having the walls thereof formed of water jackets arranged ln upper andl lower sections, a series of small outwardly removhle water cooled chambers containing thc furnace twyerse conf tiguously arranged in`the furnace Walls, intermediate of @mees 'said upper and iower seetionsof Water jackets, .in such 1U manner as to form when in piace, a section of the furnace walls, and clamps for holding said twyer chambers in p0- sition; asshown and described and for thepurpose Set forth.

JOHN W. MADONALD. Witnesses: l

W. '.L. DoBsoN, J. C. Forum. 

